CVE-2011-0766

The random number generator in the Crypto application before 2.0.2.2, and SSH before 2.0.5, as used in the Erlang/OTP ssh library before R14B03, uses predictable seeds based on the current time, which makes it easier for remote attackers to guess DSA host and SSH session keys.

Published: 2011-05-31 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-0766 is rated Moderate Risk (60.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.05%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-0766

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 3.37% 3.05% -0.32%
2 2025-04-21 2.51% 3.37% +0.86%
3 2025-03-30 — 2.51% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-0766

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2011-0766

OS Trackers for CVE-2011-0766

vendor priority summary link
debian low CVE-2011-0766 low priority: Debian including 1 source packages (erlang), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-0766
ubuntu low CVE-2011-0766 low priority: Ubuntu including 1 source packages (erlang), 9 status rows across 9 suites (hardy, lucid, maverick, natty, oneiric, precise, quantal, raring, upstream): ignored 5, not-affected 3, released 1. https://ubuntu.com/security/CVE-2011-0766

Affected software / configurations for CVE-2011-0766

Vendor Product Version Raw CPE
erlang crypto <= 2.0.2.1 cpe:2.3:a:erlang:crypto:*:*:*:*:*:*:*:*
erlang erlang\/otp r11b-5 cpe:2.3:a:erlang:erlang\/otp:r11b-5:*:*:*:*:*:*:*
erlang erlang\/otp r12b-5 cpe:2.3:a:erlang:erlang\/otp:r12b-5:*:*:*:*:*:*:*
erlang erlang\/otp r13b cpe:2.3:a:erlang:erlang\/otp:r13b:*:*:*:*:*:*:*
erlang erlang\/otp r13b02-1 cpe:2.3:a:erlang:erlang\/otp:r13b02-1:*:*:*:*:*:*:*
erlang erlang\/otp r13b03 cpe:2.3:a:erlang:erlang\/otp:r13b03:*:*:*:*:*:*:*
erlang erlang\/otp r13b04 cpe:2.3:a:erlang:erlang\/otp:r13b04:*:*:*:*:*:*:*
erlang erlang\/otp r14a cpe:2.3:a:erlang:erlang\/otp:r14a:*:*:*:*:*:*:*
erlang erlang\/otp r14b cpe:2.3:a:erlang:erlang\/otp:r14b:*:*:*:*:*:*:*
erlang erlang\/otp r14b01 cpe:2.3:a:erlang:erlang\/otp:r14b01:*:*:*:*:*:*:*
erlang erlang\/otp r14b02 cpe:2.3:a:erlang:erlang\/otp:r14b02:*:*:*:*:*:*:*
ssh ssh <= 2.0.4 cpe:2.3:a:ssh:ssh:*:*:*:*:*:*:*:*

References for CVE-2011-0766

cvelogic Threat Intelligence